Sony MHC-V90DW Operating Instructions Manual page 14

Touch panel:
You can lock the keys except  (power) on the unit to prevent them from
being operated by mistake (page 67).
Disc tray area:

(USB) (REC/PLAY) port
Use to connect a USB device.
This port can be used for both
playback and music transfer.
 LIGHT MODE key (page 66)
 PARTY LIGHT key (page 66)
PARTY CHAIN key
(page 63)
14
GB
 BLUETOOTH indicator
(page 45)
BLUETOOTH key
Touch to select the BLUETOOTH
function.
PAIRING key
Touch and hold to activate
BLUETOOTH pairing during the
BLUETOOTH function.